Improvement in low-water alarms



i Nrrnn ,STATES JOHN C. LEISTNER AND AUGUSTUS KAYSER, OF CINCINNATI,OHIO.

IMPROVEMENT IN LOW-WATER ALARMS.

Specification forming part of Letters Patent No. 119,037, datedSeptember`19, 1871.

To all whom it may concern:

Be it known that we, JOHN G. LnIsTNnR and AUGUSTUS KAYsER, both ofCincinnati, Hamilton county, Ohio, have-invented a new and usefulLoW-Water Alarm for Steam- Generators, of which the following is aspecification:

Thisis an improvement in the class of low- Water alarms whichcomprises apipe that pene trates the top of the boiler and terminates alittle belowthe desired water level, and which rises somewhat above the boiler, andis surmoimted by a whistle and supplied interiorly with a valve. In thisclass of alarms the valve is so adjusted relatively tothe pipe as toremain closed whenever the latter is charged ,with water, which thepressure of steam causes it constantly to be whenever the surface levelof the water is above the bottom of the pipe. The instant, however, thatthe boiler becomes so far depleted as for the water to leave the mouthof the pipe that within the pipe is replaced by steam, which, heatingthe valve-pipe, acts to ,open the valve and to sound the whistle. Aserious difficulty, however, intervenes to prevent the uniform andeifective action of this class of safety devices, owing to the liabilityof the steam to force water up with it into the pipe, which water,reaching the whistle, prevents the sounding of the same. This primingaction, with the objectionable results above specified, we eiectuallyprevent by inclosing that part of the pipe which enters the boiler in anenlarged mouth-piece, whose lower or open extremity is placed at thewater level, and at a lower elevation than the mouth of the pipe proper,which is shortened for that purpose. The ei'ect of this is that thecurrent of steam in ascending the comparatively wide area of themouth-piece becomes slackened in speed sufficiently to part with itsmechanically suspended water, which falls back into the boiler beforereaching the mouthfof the pipe.

The accompanying drawing is a partially-seotionized elevation of analarm provided with our improvements Arepresents a portion of asteam-generator 5 B, an alarm of custom ary form, except that its pipe Openetrates but a short distance into the boiler and is surrounded by amouth-piece, Din the form of an inverted cup or cylinder of much largerdiameter than the pipe proper, and Whose lower or open end isconincident with the level of subsidence, at which-it is desired thatthe alarm shall take place. Our device also diii'ers from the customaryform in its provisions for attachment and adjustment, which we will nowproceed to describe. The pipe G is screw-threaded, c, to occupy acorresponding screw-threaded boss, E, which surrounds the opening of theboiler. The pipe C being screwed up or down to its desired positionissecured thereto by means of nuts F and G. The mouth-piece Dhas ascrew-threaded orifice, by which itis securedto the screw-threaded lowerportion of the pipe at any desired elevation relatively thereto and tothe boiler. We claim as new and of our inventionl. The arrangement ofthe pipe G projecting into the enlarged mouth-pieceD within the boiler,

as described and represented, for the purpose set forth.

2. In the described combination with the elements of the precedingclause, the devices C E F G, whereby the alarm-inlet and its mouthpieceare secured at any desired elevation relatively to each other and to theboiler, for the object designated. p

In testimony of which invention we hereunto set our hands.

JOHN C. LEISTNER. AUGUSTUS KAYSER. Witnesses:

v GEO. H. KNIGHT,

J AMES H. LAYMAN.

